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Table 1 Notations

From: A secure and privacy-preserving authentication protocol for wireless sensor networks in smart city

Notations Descriptions
\(U_{i}\) ith user
\(USC\) The user’s smart card
\(S_{j}\) jth sensor node
\(GWN\) Gateway node
\(S_{g}\) Secret key of the gateway node
\(PK_{g}\) Public key of the gateway node
\(GWNPS_{j}\) Secret key of the gateway node shared with the sensor node
\(GWNPU_{i}\) Secret key of the gateway node shared with the user
\(UID_{i}\) User’s identity
\(UPWD_{i}\) User’s password
\(SID_{j}\) Sensor node's identity
\(BIO_{i}\) User’s biological information
\(T_{x}\) Current timestamp
\(\Delta T\) Allowed transmission delay
\(SK\) Shared session key
\(E_{x} ()/D_{x} ()\) Encryption or decryption function using x
\(h()\) One-way hash function
\(BH()\) Bio-hash operation
\(\oplus\) Performing XOR operation
|| Concatenation operation